Evaluation of Strain Effects on Grain Boundary Engineering Mechanisms Using In Situ TEM

2021 ◽  
Author(s):  
Asher Calvin Leff
Keyword(s):  
Grain Boundary ◽  
In Situ Tem ◽  
Grain Boundary Engineering ◽  
Strain Effects

In situ TEM and multiscale study of dislocation loop formation in the vicinity of a grain boundary

2020 ◽  
Vol 528 ◽  
pp. 151872 ◽  
Author(s):  
Qingshan Dong ◽  
Peyman Saidi ◽  
Laurent K. Béland ◽  
Zhongwen Yao ◽  
Cong Dai ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Dislocation Loop ◽  
In Situ Tem ◽  
Loop Formation

Grain boundary shear–migration coupling—I. In situ TEM straining experiments in Al polycrystals

2009 ◽  
Vol 57 (7) ◽  
pp. 2198-2209 ◽  
Author(s):  
F. Mompiou ◽  
D. Caillard ◽  
M. Legros
Keyword(s):  
Grain Boundary ◽  
In Situ Tem ◽  
Boundary Shear

In situ TEM nanoindentation and dislocation-grain boundary interactions: a tribute to David Brandon

2006 ◽  
Vol 41 (23) ◽  
pp. 7704-7719 ◽  
Author(s):  
Jeff T. M. De Hosson ◽  
Wouter A. Soer ◽  
Andrew M. Minor ◽  
Zhiwei Shan ◽  
Eric A. Stach ◽  
...  
Keyword(s):  
Grain Boundary ◽  
In Situ Tem

In Situ TEM Analysis of Facet Motion in Gold Σ=3 {112} Boundaries

2001 ◽  
Vol 7 (S2) ◽  
pp. 324-325
Author(s):  
D.L. Medlin
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Microstructural Evolution ◽  
Experimental Studies ◽  
In Situ Tem ◽  
Tem Analysis ◽  
Computational Approaches ◽  
Boundary Properties ◽  
Boundary Curvature

Interfacial anisotropy complicates the prediction of microstructural evolution, particularly ir extreme cases for which the presence of facets and corners prevents the application of classical notions of grain-boundary curvature. Although there has been much effort at incorporating anisotropic grain-boundary properties, including faceted geometries, into computational approaches for microstructural evolution, at present our mechanistic understanding of the behavior of facets anc their junctions remains limited. In this presentation, we investigate the development of faceted boundaries between Σ=3 <111> oriented grains in epitaxially deposited gold thin films. This system is well suited tc experimental studies of facet evolution since the crystallography and structure of the boundaries is already well understood. It is well known that “double-positioning” of epitaxially aligned <111> grains on a surface of three-fold or six-fold symmetry results in a microstructure composed of grains in two twin-related (Σ=3) variants that are separated by facets running vertically through the film and forming 120 degree corners [1,2].

Evidence from in situ TEM straining studies for the mechanism of transfer of slip across a grain boundary

1988 ◽  
Vol 46 ◽  
pp. 616-617
Author(s):  
I.M. Robertson ◽  
T.C. Lee ◽  
P. Rozenak ◽  
G.M. Bond ◽  
H.K. Birnbaum
Keyword(s):  
Mechanical Properties ◽  
Grain Boundary ◽  
Transfer Process ◽  
Boundary Structure ◽  
In Situ Tem ◽  
Boundary Dislocation ◽  
Dislocation Source ◽  
Structure Changes ◽  
Matrix Dislocation

The bulk mechanical properties of a material will primarily be determined by the integrity of the grain boundaries which depends on the local chemistry and the boundary structure. Changes in the composition of the boundary may affect the strength of the atomic bonds through a redistribution of the electrons; this effect has been predicted from theoretical calculations1 but not determined experimentally. The structure of the boundary will be determined by the mismatch between the adjoining grains and it will affect the mechanism by which strain is transferred through the boundary. From static observations of the interaction between matrix and grainboundary dislocations the following scenario has been constructed for the transfer process through random boundaries; The interaction between the incoming matrix dislocation and those in the grain boundary cause the emission of a dislocation from a grain-boundary dislocation source into the adjacent grain. To preserve the contiguity of the grain boundary a residual dislocation will be created within the grain boundary.

Dislocation Interaction with a Σ=3 Grain Boundary Observed by in situ TEM

1998 ◽  
Vol 294-296 ◽  
pp. 397-400 ◽  
Author(s):  
T. Vystavěl ◽  
Alain Jacques ◽  
A. Gemperle ◽  
J. Gemperlová ◽  
A. George
Keyword(s):  
Grain Boundary ◽  
In Situ Tem ◽  
Dislocation Interaction

Grain Boundary Responses to Local and Applied Stress: An In Situ TEM Deformation Study

2006 ◽  
Vol 976 ◽  
Author(s):  
Bryan Miller ◽  
Jamey Fenske ◽  
Dong Su ◽  
Chung-Ming Li ◽  
Lisa Dougherty ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Transmission Electron Microscope ◽  
In Situ Tem ◽  
Deformation Twins ◽  
Transmission Electron ◽  
Dislocation Interactions

AbstractDeformation experiments at temperatures between 300 and 750 K have been performed in situ in the transmission electron microscope to investigate dislocation interactions and reactions with grain boundaries and other obstacles. Dislocations, both partial and perfect, as well as deformation twins have been observed being emitted from grain boundaries and, in some cases, even the same grain boundary. The ejection of dislocations from the grain boundary can result in its partial or total annihilation. In the latter case, the disintegration of the grain boundary was accompanied by grain growth and a change in misorientation.

In situ TEM studies of deformation and fracture

1989 ◽  
Vol 47 ◽  
pp. 622-623
Author(s):  
I.M. Robertson ◽  
T.C. Lee ◽  
D.K. Dewald ◽  
H.K. Birnbaum
Keyword(s):  
Grain Boundary ◽  
Video Camera ◽  
In Situ Tem ◽  
Video Tape ◽  
Slip Systems ◽  
Camera System ◽  
Dynamic Events ◽  
Transmission Electron ◽  
Deformation And Fracture

The in-situ TEM straining technique has been used to investigate the micromechanisms of deformation and fracture in several ductile and semi-brittle systems. Attention has been focussed on the dislocation structures ahead of advancing cracks and on the interaction between lattice dislocations and grain boundaries.The deformation experiments were performed in-situ in a transmission electron microscope equipped with a video camera system. The dynamic events were recorded on video tape with a time resolution of l/30th of a second. Static interactions were recorded using the regular microscope plate system. The straining stage deforms the samples in Mode I and can operate at a displacement rate of 4 in sec-1.An example of one of the possible interactions between lattice dislocations and a ∑- 3 ([ll)/60°) grain boundary in 310 stainless steel is shown in the micrograph in Figure 1. The dislocations on slip systems A (a/2[110)1 (ll) 1 ) and B (a/2[101] (11) 1 ) impinge on the grain boundary, generating slip systems C (a/2[l0) 2/(111) 2) and D (a/2[l0) 2/(111) 2). To understand this effect three conditions were considered:

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